Combined removal device and method for sulphur, mercury and nitrate in smoke

A combined removal and flue gas technology, applied in the combined removal of nitrate, sulfur in flue gas, and mercury fields, can solve the problems of mercury elements not being recycled, high cost, and weakened economy, so as to reduce investment costs, The effect of reducing consumption and reducing operating costs

Active Publication Date: 2014-07-02
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology chooses lye as the absorbent, even if the removal efficiency of pollutants is high, considering the large amount of CO in the flue gas 2 , SO 2 and NO x , the cost would be very high and greatly weaken the economics of the technology; there is no recycling of elemental mercury

Method used

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  • Combined removal device and method for sulphur, mercury and nitrate in smoke
  • Combined removal device and method for sulphur, mercury and nitrate in smoke
  • Combined removal device and method for sulphur, mercury and nitrate in smoke

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Tower body part: This part removes the pollutants in the flue gas in two layers. The dust from the dust collector contains SO 2 , NO, NO 2 , Hg 2+ (g) and Hg 0 (g) The flue gas at 90-120°C enters the lower layer of the tower body from the flue gas inlet 1, and the desulfurizer slurry in the desulfurizer slurry pool 2 is controlled by the first pH value online monitoring feedback adjustment device 18 to control the pH at 5.8-6.2 In between, the desulfurizer slurry is adjusted by the flow control valve 3, and is transported to the desulfurizer slurry spray pipe 5 by the desulfurizer slurry circulation pump 4-1, and is sprayed upward by the desulfurizer slurry spray pipe 5 to form a liquid curtain. Contact with the liquid curtain to generate mass transfer and reaction to remove SO in flue gas 2 , NO 2 and Hg 2+ (g). Contains NO and Hg at this time 0 The flue gas of (g) continues to go up, turns a bend in the space between the oxidant slurry tank 6 and the oxidant s...

Embodiment 2

[0070] In the first electrolytic cell 13 or the second electrolytic cell 14 in Example 1, the oxidant slurry in the upper layer of the tower body oxidizes NO and Hg 0 At the same time as (g), it is in a state of continuous energization and electrolysis. The working process of this embodiment is similar to that of Embodiment 1, and the difference from Embodiment 1 is that Hg in the flue gas 0 (g) When the concentration is low, the first electrolytic cell 13 or the second electrolytic cell 14 is not energized and electrolyzed until the Hg in the oxidant slurry is 2+ (l) After accumulating to a certain concentration, then electrify and desorb Hg 0 (l), which can save power consumption compared with continuous energization of electrolysis.

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Abstract

Disclosed are combined removal device and method for sulphur, mercury and nitrate in smoke. The device comprises a sulphur removal system, a combined mercury-nitrate removal system, a mercury ion recovery system, an elementary mercury recovery system, and an oxidant regeneration system. The sulphur removal system is disposed on the lower portion of a column. The combined mercury-nitrate removal system is disposed on the upper portion of the column. The mercury ion recovery system is connected with the bottom of the sulphur removal system. The elementary mercury recovery system is connected with the combined mercury-nitrate removal system. The oxidant regeneration system is connected with the elementary mercury recovery system. The removal method includes smoke purification, mercury atom recovery and chlorine atom recycling. The removal device and method have the advantages that the structure is simple, integrity is high, operational cost is low, materials are recycled, and byproducts can be recycled.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a combined removal device for sulfur, mercury and nitrate in flue gas and a removal method thereof. Background technique [0002] Sulfur, mercury and nitrate are the main pollutants in the flue gas of power station boilers. Sulfur and nitrate form acid rain, and mercury is a highly toxic heavy metal element. The environmental and health problems caused by these pollutants are increasingly affecting the sustainable development of the national economy and human health. [0003] The current mainstream desulfurization technology is limestone gypsum wet flue gas desulfurization (WFGD), which has mature technology, high removal efficiency and reliable process. Hg in the air 2+ (g) and NO 2 , but does not absorb NO and Hg 0 (g), so far from NO x and Hg control requirements. The main denitration method at this stage is selective catalytic reduction (SCR)....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/60B01D53/64B01D50/00C22B43/00
CPCY02P10/20
Inventor 李娜陈潞周屈兰常彦张勇胡斌
Owner XI AN JIAOTONG UNIV
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